Lapis lazuli is one of the most prominent gemstones that are available in the market these days. Also, it is one of the rarest because of the fact that its deposits aren???t available as much as the other gems that include ruby, diamond or even emerald. However, still it can be valuable information to those who wish to know its basic facts and characteristics. The chemical composition for the rock is pyrite, calcite, noselite, sodalite, hauynite and lazurite. Their chemical formulae include FeS2, CaO3, Na8(AlSiO4)6SO4, Na8(AlSiO4)6Cl2, (Na,CA)4-8(A;SiO4)6(SO4)1-2 and (Na,CA)8(AlSiO4)6(SO4,S,Cl)2 respectively.

lapis lazuli jewelryAs for the color variations, the lapis lazuli can be seen in deep blue color with several inclusions that are pyrite in nature. Sometimes many have also stated that calcite lines which are white in color are also seen. Some other popular color shadesLapis-lazuli-Bracelet of the gemstone include greenish blue and purplish blue. The hardness of the stone varies from five to six mohs which means that it is not too hard and not too soft either. However, this hardness makes it difficult for the craftsmen to do a lot with the stone thereby making it difficult to get a lot of designs possible. The refractive index of the stone is a clear 1.50 and can be used to check its genuineness.

As for the specific gravity, it varies between 2.7 and 2.9 but it is seen to grow more with the increase in the pyrite in the stone.lapis lazuli ring The luster of this gem is quite greasy and it is quite opaque looking in its solid state. Because of it being a rock and not a crystal, it does not possess any crystal system. There are uneven fractures present in the rock with no phenomena and no pleochroism. The stone is enhanced from time to time to improve the durability and color by impregnation and also dying.

The main sources of the stone are Pakistan, Mongolia, Italy, Russia, Canada, Burma, United States, Siberia, Chile and Afghanistan. The users owning this rock should know about the producer precautions that are mentioned on the web or in the form of manuals. The basic instructions include protecting them from harsh cleaning items that are used normally in houses, cosmetics, frequent and large changes in temperature and also from sunlight. One can see now that this rock is mostly kept for internal pleasures and for showing off to those who come home as opposed to proudly wearing it on the streets like a diamond or emerald.lapis lazuli from United States